Dell XPS 13 / 15 base cover screw size
M2.5 · 8 to 10 mm long
If you are replacing a screw on Dell XPS 13 / 15 base cover, the thread is M2.5 in lengths from 8 to 10 mm.
The record covers captive Torx screws holding the bottom panel on.
Head and drive, as the source states them: Torx drive.
This entry is marked reported and comes from dl.dell.com.
M2.5 means a 2.5 mm nominal diameter with a 0.45 mm thread pitch. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Dell XPS 13 / 15 base cover screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M2.5 | 8–10 mm | 0.45 mm | not stated | Torx | captive Torx screws holding the bottom panel oncaptive | Reported |
Fitment records and sources
captive Torx screws holding the bottom panel on
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 8–10 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Torx drive. For comparison, standard M2.5 heads take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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M2.5 x 10mm Phillips Wafer Head Screw for Turntable Cartridge Headshell Mount - Pack of 50 Black
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M2.5 x 10mm Phillips Wafer Head Screw for ASUS TUF Gaming A15/F15 Laptop Repair - Single Replacement Black
$0.10 each · min. 50
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25x M2.5 x 8mm Phillips Screws for Acer Nitro 5 LCD Hinge Assembly
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M2.5 x 8mm Black Wafer Head Screws for Lenovo ThinkPad X131e Chromebook Palmrest Replacement – 10-Pack Black
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M2.5 x 10mm Phillips Wafer Head Screw for Laptop Bottom Cover Replacement - Single Replacement Black
$0.10 each · min. 50
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Devices whose records share a thread with Dell XPS 13 / 15 base cover, closest length match first.
- HP EliteBook 2560p also M2.5 × 8 mm
- Acer Aspire 5241 also M2.5 × 8 mm
- Dell Vostro 15 3568 also M2.5 × 8 mm
- Lenovo ThinkPad X140e also M2.5 × 8 mm
- Acer Aspire 2930 also M2.5 × 8 mm
- Dell Latitude E4300 also M2.5 × 8 mm
- HP Presario Widescreen X1000 also M2.5 × 9.5 mm
- HP Compaq 6510b also M2.5 × 8 mm
Questions about Dell XPS 13 / 15 base cover screws
- What size screw does Dell XPS 13 / 15 base cover use?
- M2.5 × 8–10 mm for captive Torx screws holding the bottom panel on.
- How long are the screws in Dell XPS 13 / 15 base cover?
- The records range from 8 to 10 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Dell XPS 13 / 15 base cover?
- The source lists a Torx drive. Standard M2.5 heads otherwise take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Dell XPS 13 / 15 base cover?
- TechSpareWarehouse (our own store) lists M2.5 x 8mm and M2.5 x 10mm, which match lengths in the records above.